Power-driven tool-grinding machine.



T. LUMSDEN.

POWER DRIVEN TOOL GRINDING MACHINE.

APPLICATION FILED APR. 8, 1915.

T. LUMSDEN.

POWER DRIVEN TOOL GRINDING MACHINE.

APPLlcATloN FILE-D APR.8'.1'915.

llm Patented June 2o, 1916.

2 SHEETS-SHEET 2.

m, www1 @www man TTM THE cDLuMmA PLANOGRAPH co.. WASHINGTON. D. C.

THOMAS LUMSDEN, 0F GATESHEAD, ENGLAND.

POlVER-DRIVEN TOOL-GRINDING MACHINE.

Specification of Letters Patent.

Patented JI" une 2U, 1916.

Application filed April 8, 1915. Serial No. 19,883.

To all whom t may concern Be it known that I, THOMASl LUMsDnN, a subject of the King of Great Britain and ireland, residing at Gateshead, in the county of Durham, England, have invented new and useful Improvements in Power-Driven Tool-Grinding Machines, of which the 'ollowing is a specilication.

rFhis invention relates to power-driven tool grinding machines of the kind wherein the grinding wheel is carried by a revoluble shaft supported by bearings carried by a frame mounted on and adapted to be oscillated about a driving shaft mounted in bearings on the bed-plate of the machine. In machines of this kind the tool-holder has been angularly adjustable in a carrier angularly adjustable on a turntable mounted on a compound slide so that it can be adjusted in two directions at right angles in a horizontal plane to move the tool to be ground toward or away from or transversely across the grinding wheel. The grinding wheel rotates on its axis and oscillates about the driving shaft which-forms the pivot oit the frame whereby the shaft of the grinding wheel is carried.

The present invention provides means 'for adjusting the shaft on which the grinding wheel is mounted in an axial direction relatively to the oscillating frame while the machine is in motion, said means being controlled from a fixed point of the machine, thereby dispensing with the compound yslides above referred to and permitting a hollow turntable to be employed with which an exhausting device can be readily connected to remove the dust during dry grinding.

l will fully describe my invention with reference to the accompanying drawings which illustrate one construction of toolgrinding machine embodying my improvements.

11i the drawings Figure 1 is a section on the line X-X in Fig. 2, looking to the right; Fig. 2 is a section on the line Y -Y in Fig. 1, looking to the left; Fig. 3 is a part section on the line ZTZ in Fig. 1, looking to the right; Fig. 4 is a section at right angles to Fig. 2 of the gear box hereinafter described; and Fig. 5 is an elevation of same at right angles to Fig. 4.

Referring to the drawings, in the machine therein illustrated an oscillatory frame 1 having hollow trunnions 2, 2 is supported by bearings 3, 3 provided on the bed-plate 4. Carried by the trunnions 2, 2 is a driving shaft 5 having a driving pulley G and aloose pulley 7. In bearings at the upper end of the frame 1 is mounted a cylindrical ram 8 which carries a shaft 9 provided at one end with a cup-shaped grinding wheel 10 and at the otherend with a pulley 11 whereby said shaft and wheel are driven by a belt from a pulley 12 on the driving shaft 5. The frame 1 is oscillated by a connecting rod 13 which is reciprocated by an eccentric, crank or other convenient means. I prefer to employ for reciprocating the connecting rod 13 variable crank mechanism of the kind illustrated in Figs. 2 and 4 of the drawings herewith. In this mechanism, which is mounted in a gear box 14 carried by a pedestal 15 (Fig. 2), one end of the connecting rod 13 is pivoted to the strap 16 of an eccentric sheave 17 which is mounted on an oblique bush 18 on a shaft 19 provided with a. toothed wheel 2O which gears with a pinion 21 on a second Shaft 22 provided with a pulley 23 driven by a belt from a pulley 24 on the driving shaft 5. The sheave 17 is adapted to be slidden axially on the oblique bush 18 by means of a claw 25 (Fig. 2) carried by a lever 26 on a spindle 27 which can be turned by a handlever 23, so that, by varying the position of said sheave upon the oblique bush 18, the stroke of the connecting rod13 can be varied. The other end of the connecting rod 13 is pivoted within a piston 29 which can be slidden axially in a cylinder 30 mounted on the frame 1 so that the point of attachment of `the connecting rod 13 to the frame 1 can be varied relatively to the center line of the frame to vary the mid-position about which the frame oscillates. The piston 29 is slidden in the cylinder 30 by means of a screw 31 carried by a bracket 32 formed on the cylinder 30 engaging with a nut carried by a lug 33 on the piston 29. The screw 31 is provided with a pinion 34 which engages a toothed wheel 35 on one end of a shaft 3G carried by and passing across the bottom of the gear box 14 and provided with a second toothed wheel 37 at its other end. There is sui'licient play between the teeth of the pinion 34 and the toothed wheel 35 to allow of the former sliding in the latter as the frame 1 is oscillated to and fro, the teeth of both wheels being rounded oit at the ends or slightly curved to perv`mit for th'erianve increment While nu remaining in engagement.

A.Theram k8 vwherein the shaft 9 of .thev

grinding wheel 10 is mounted, is provided with a rack 38 with which engages apinion -39 mounted on a spindle40 4carried by a lug 41-on the cylinder 30. The pinion 39 is en- 46 provided with a toothed wheel 47 (Fig.V

Y gaged by a worm 42 (Figs. 1 and 3) on one end of a spindle 43 also supported from the cylinder 30. TheY other end ofthe spindle 43 is provided with a bevel wheel 44 gearing with a complementaryV wheel 45 on a shaft 3) gearing with a pinion 48 (Figs. 1, 3 and V5) on a shaft 49 carried by and passing lthrough the gear -boX 14 and provided at its Y Y the'wheel 47 `-and those'of the pinion 48 toy j Vtheframe 1 oscillates to and fro, theteeth of 7,. both Wheelsbein'g rounded off Yat the ends'or Y n slightlyV curved toY permit of the relative outer'end with a'hand-wheel 50 (Fig. 5).

There is suic'ient play between theV teeth of permit'of the former'sliding'in the latter as movement vvhile'V still 'remaining in engagement. O n the shaft Y49 is a loose sleeve 51 provided with Va handrwheel 52 and a toothed-wheel 53 which gearsV with the toothed wheel 37 on the shaft 36."

The tool-box 54V (Fig. 1) for receiving the tool to be ground is provided with trunnions 55 supported by brackets 56 on a hollow vturntable 57 carried by a pedestal 58 lwhich also carriesrtheusual.trough 59. The turntable 57 is provided with aeentral funnel 60 which opens at its lower end'into a pipe 61 Y which isl'connectedV toV the inlet Vof a centrifngal fan 62 (Fig. 2)V driven by a belt Vpassing around a pulley 63 on the driving shaft 5. In; this way the dust resulting from dry grinding ofthe tools will vbe sucked downV the 'funnel' 60 bythe fan 62 and deliveredintoadust box 64. 65 (Fig. 1) is aV piegedapted to beine-.rad in the mouth 0f x`4'5V-the funnel 60'Ywhen the machine isfused for -Wet grinding. v

L `AIt will now be seen that, on rotation of the driving `shaft,5,-thefshaft 9 and grinding wheel 10 will Ybe rotated by thebelt'passing over the pulleysr12 and 11, and the shaft 19 in the tool box14 will be 4rotated bythe belt passing over theV pulleys 24 and23, through `Vthe shaftr22,fpinion 21 and toothedV wheel 20,.'tofcausethe connectingV rod 13 through thevariable crank mechanism to Vvoscillate V.the vframe 11andthusY carry the grinding 1 ground which i's'carriedfby-the tool box 54.

" I )juring'oscillation` the "grindingwheel 10 can .bef moved-toward orfV away from the' tooll by means-of the handwheel() through its shaft line of the frame 1 by sliding the piston 29 in the cylinder 30 by means of the handwheel 52 on the sleeve 51 through the toothed wheels 53 and 37, shaft 36, toothed wheel 35, pinion 34, and screw 31, and thus the midposition about which the frame 1 and grinding wheel 10 oscillate can be moved trans- .versely across the tool, this motion being equivalent to the transverse motion of the tool across the grinding wheel obtained by a transverse slide. l Moreover the stroke of the connecting rod 13 can be varied by sliding the eccentric sheave 17 upon the oblique bush 18 by means of the handlever28,lever 26 and claw 25. The tool-box 54 can be swung around upon the turntable 57 as usual to vary the angle at which the tool is presented to the grinding wheel 10.

What I claim and desire to secure by Letters Patent is 1. A power-driven tool grinding machine comprising a bed plate, a main shaft mounted on said bed plate, a frame mounted. on said shaft and adapted to be oscillated thereabout, means for oscillating said frame, a shaft in said frame, a grinding wheel on said shaft, means for' driving said shaft from the main shaft, and means for adjusting the shaft on which the grinding wheel is mounted in an axial direction relatively to the oscillating frame, said means being controlled from a fixed point of the machine and said means being capable of being operated while the machine is in motion.

l2. A powerdriven tool grinding machine comprising a bed plate, a main Vshaft mounted on said bed plate, a frame mounted on said shaft and adapted to be oscillated thereabout, means for oscillating said frame, a shaft in said frame, a grinding wheel on said shaft, means for driving said shaft from the main shaft, means for adjusting the shaft on which the grinding wheel is mounted in an axial direction relatively to the oscillating frame, and means for adjusting in a transverse direction relatively to the tool the mid-position about which the frame and grinding wheel oscillate.

3. Arpower-driven tool grinding machine comprising a bed plate, a main shaft' mounted on said bed plate, a frame mounted on Vsaid shaft and adapted to be oscillated thereabout, means for oscillating said frame, a ram in said frame, a shaft mounted 1n said Vram, a. grinding wheel on said shaft, means for driving said Vshaft from the main shaft, means for adjusting the shaft on which the grinding wheel is mounted in an axial direction relatively to the oscillating frame, said means comprising a rack on said ram, a. pinion on said column and means" for operatingsaid pinion from a xed point of the machine While the machine is inl motion.

'4. A power-driven tool grinding machine comprising a bed plate, a main shaft mount` ed on said bed plate, a frame mounted on said shaft and adapted to be oscillated thereabout, a connecting rod attached to the oscillating iframe, means for adjusting the point oi' attachment of said connecting rod to the irame, means to operate said connect ing rod, a shaft in said frame, a grinding wheel on said shaft, means :for driving said sha't from the main shaft, and means for adjusting the shaft on which the grinding wheel is mounted in an axial direction relatively to the oscillating iframe, said means being controlled from a fixed point of the machine and said means being capable of being operated while the machine is in motion.

5. A power-driven tool grinding machine comprising a bed plate, a main shaft mounted on said bed plate, a :frame mounted on said shaft and adapted to be oscillated thereabout, means for oscillating said frame, a shaftv in said frame, a grinding wheel on said shaft, means for driving said shaft from the main shaft, means for adjusting the shaft on which the grinding wheel is mounted in an axial direction relatively to the oscillating frame, said means being controlled from a fixed point of the machine and said means being capable of being operated While the machine is in motion, a hollow turntable, a tool-box mounted on said turntable, and means for exhausting the dust from the grinding wheel and tool through said hollow turntable.

6. Means for Xedly holding an object to be ground, means for rotating, and oscillating a grinding wheel, and further means for oscillating said grinding wheel. 7. Means for fixedly holding an object to be ground, means for rotating, and oscillating a grinding Wheel, and further means for oscillating said grinding wheel from a ixed point.

8. Means for Xedly holding an object to be ground, a grinding wheel, a frame for said wheel, means for rotating the grinding wheel, means for oscillating said frame and grinding wheel, means for varying the amount of said oscillation, and means for' varying the mid-position about which the said wheel oscillates.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

THOMAS LUMSDEN. Witnesses HERER'l` HOWARD, HENRY A. HUNTER.

@opiea of thin patent may be obtained for ve senta each, by Eddreain the Commiiiaioner at Matmata, Wanihinmtom, D. E. 

